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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f70d41793ce5ed0711ad9910847d16a701342a7ee935401176e363bbcc8389' 
  AND token = 'Dh692Uhm9/S+iwaa+/0UyYn6STa7eIcs45jqes1gZ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}